Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Quantas rodadas durou a partida quando seu recorde era 6-6?
 ###Tabelas: CREATE TABLE wga_awards (wga_awards_id AUTO_INCREMENT PRIMARY KEY, Year INT, Category VARCHAR, Nominee(s) VARCHAR, Episode VARCHAR, Result VARCHAR) CREATE TABLE mixed_martial_arts_record (mixed_martial_arts_record_id AUTO_INCREMENT PRIMARY KEY, Res. VARCHAR, Record VARCHAR, Opponent VARCHAR, Method VARCHAR, Event VARCHAR, Round VARCHAR, Location VARCHAR) CREATE TABLE mixed_doubles:_8_5_titles_3_runner–ups (mixed_doubles:_8_5_titles_3_runner–ups_id AUTO_INCREMENT PRIMARY KEY, Outcome VARCHAR, Year INT, Championship VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponents VARCHAR, Score VARCHAR) CREATE TABLE best-selling_video_games_of_the_decade (best-selling_video_games_of_the_decade_id AUTO_INCREMENT PRIMARY KEY, Rank INT, Title VARCHAR, Release Date VARCHAR, Franchise VARCHAR, Developer(s) VARCHAR, Platform VARCHAR, Units sold (in Millions) INT) CREATE TABLE record_vs._sec_opponents (record_vs._sec_opponents_id AUTO_INCREMENT PRIMARY KEY, Missouri vs. VARCHAR, Overall Record VARCHAR, at Columbia VARCHAR, at Opponent's Venue VARCHAR, at Neutral Site VARCHAR, Last 5 Meetings VARCHAR, Last 10 Meetings VARCHAR, Current Streak VARCHAR, Since Joining SEC VARCHAR)  
SELECT Round FROM mixed_martial_arts_record WHERE Record = 6-6